(Na_1/2Bi_1/2)TiO₃‐based lead‐free co‐fired multilayer actuators with large strain and high fatigue resistance

Abstract

Large‐strain multilayer actuators (MLAs) were fabricated by tape‐casting 0.91(Na1/2 Bi1/2)TiO3–0.06BaTiO3–0.03AgNbO3 (NBT‐BT–3AN) lead‐free incipient piezoceramics co‐fired with Pt inner electrodes. Microstructures, dielectric properties, unipolar and bipolar strain, as well as fatigue properties of the MLAs were investigated. It was found that the actuator consisting of 15 ceramic layers with individual thicknesses of 114 μm could output a large unipolar strain of 0.3% and a dynamic displacement of 5 μm at 6 kV/mm at room temperature. It exhibited excellent cycling stability and provided a high strain of 0.23% after 107 cycles at 6 kV/mm. Moreover, these MLAs still can deliver a strain of 0.20% at 125°C.

High-performance (K,Na)NbO 3-based multilayer piezoelectric ceramic actuators with nickel inner electrodes

“…The strain of bulk ceramics can reach 0.20% at 4 kV/cm, while that of MLCA sample is 0.18%. The large coercive electric field and relatively low strain in MLCA sample are consistent with the effect of the mechanical constraint and the induced stress caused by the interface contact between the ceramic and electrode layers during sintering process [2,25,29]. Besides, the inner electrode area is smaller than the sample's cross-section for insulation purpose.…”

Re‐entrant dipole glass‐like behavior and lattice dynamics of 0.65Bi(Mg1/2Ti1/2)O3‐0.35PbTiO3

“…In order to extend materials' applicability to modern electronics, the information on local structure and physical properties is of great interest for fundamental studies. 1,2 It is reported that a re-entrant relaxor behavior is presented in BaTiO 3 -BiScO 3 , BaTiO 3 -Bi(Zn 2/3 Nb 1/3 )O 3 , and (K 0.5 Na 0.5 ) NbO 3 -(Na 1/2 Bi 1/2 )TiO 3 . [3][4][5] Meanwhile, the similar behaviors have been reported in Pb/Bi-based perovskites, such as (Ba 0.925 Bi 0.05 )(Ti 1-x/100 Sn x/100 )O 3 and Pb 0.76 Ca 0.24 TiO 3.…”

“…In order to extend materials' applicability to modern electronics, the information on local structure and physical properties is of great interest for fundamental studies . It is reported that a re‐entrant relaxor behavior is presented in BaTiO 3 –BiScO 3 , BaTiO 3 –Bi(Zn 2/3 Nb 1/3 )O 3 , and (K 0.5 Na 0.5 )NbO 3 –(Na 1/2 Bi 1/2 )TiO 3 .…”

Strain-Modulated Electronic and Thermal Transport of Monolayer Black Arsenic Phosphorus

“…Until 2014, researchers successfully prepared two-dimensional black phosphorus field-effect transistors [1], and then people discover black phosphorus has great application potential in energy storage devices, optoelectronic devices, photocatalysis, biosensing, etc. [2][3][4][5][6][7][8][9][10][11][12]. Later, based on black arsenic phosphorus (B-AsP) research, an international research group from Germany and the United States made field-effect transistors using a new method that does not require high pressure to synthesize B-AsP, which can reduce the energy of the manufacturing process, thereby reducing costs [13].…”